001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.spring.data;
023
024import org.springframework.data.domain.Pageable;
025import org.springframework.data.domain.Sort;
026
027public class OffsetPageRequest implements Pageable {
028    
029    private int offset;
030    private int pageSize;
031    private Sort sort;
032    
033    public OffsetPageRequest(int offset, int pageSize, Sort sort) {
034        this.offset = offset;
035        this.pageSize = pageSize;
036        this.sort = sort;
037    }
038
039    public int getOffset() {
040        return offset;
041    }
042
043    public int getPageNumber() {
044        return pageSize > 0 ? offset / pageSize : 0;
045    }
046
047    public int getPageSize() {
048        return pageSize;
049    }
050
051    public Sort getSort() {
052        return sort;
053    }
054
055        public boolean hasPrevious() {
056                return offset > 0;
057        }
058
059        public Pageable first() {
060                return new OffsetPageRequest(0, pageSize, sort);
061        }
062
063        public Pageable previousOrFirst() {
064                if (offset > pageSize)
065                        return new OffsetPageRequest(offset-pageSize, pageSize, sort);
066                else
067                        return new OffsetPageRequest(0, pageSize, sort);
068        }
069        
070        public Pageable next() {
071                return new OffsetPageRequest(offset+pageSize, pageSize, sort);
072        }
073}